input data with samples from just one class

[Mohammad-Bakhtiari]

When in the input data there are samples of one class(in a binary classification data), the app fails.

Config.yml:

fc_random_forest: input: train: "data.csv" test: "data.csv" output: pred: "pred.csv" proba: "proba.csv" test: "test.csv" format: sep: "," label: "10" split: mode: file # directory if cross validation was used before, else file dir: . # data if cross validation app was used before, else . estimators: 100 # number of trees in the forest mode: classification # classification or regression random_state: 42 # random state for reproducibility

logs:

`2021-08-31 15:44:16,406 CRIT Supervisor running as root (no user in config file)
2021-08-31 15:44:16,407 INFO supervisord started with pid 8
2021-08-31 15:44:17,411 INFO spawned: 'nginx' with pid 11
2021-08-31 15:44:17,415 INFO spawned: 'app' with pid 12
Starting app
Bottle v0.12.19 server starting up (using WSGIRefServer())...
Listening on http://localhost:5000/
Hit Ctrl-C to quit.

2021-08-31 15:44:19,356 INFO success: nginx entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
2021-08-31 15:44:19,357 INFO success: app entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
[CTRL] POST /setup
Received setup: 0 True ['0']
Reading input...
127.0.0.1 - - [31/Aug/2021 15:44:21] "POST /api/setup HTTP/1.0" 200 0
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:44:21] "GET /api/status HTTP/1.0" 200 39
Read input. Have [165] samples.
Calculate local values...
Trained random forests
Forest done
Writing output
Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/threading.py", line 926, in _bootstrap_inner
self.run()
File "/usr/local/lib/python3.7/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "/app/app/logic.py", line 258, in app_flow
write_output(os.path.join(base_dir_out, self.output_proba), {'prob_0': results_proba[0][:, 0], 'prob_1': results_proba[0][:, 1]})
IndexError: index 1 is out of bounds for axis 1 with size 1

[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:44:26] "GET /api/status HTTP/1.0" 200 38
[CTRL] GET /data
Submit data
127.0.0.1 - - [31/Aug/2021 15:44:26] "GET /api/data HTTP/1.0" 200 49977
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:44:31] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:44:36] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:44:41] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:44:46] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:44:51] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:44:56] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:45:01] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:45:11] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:45:16] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:45:21] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:45:26] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:45:31] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:45:36] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:45:41] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:45:46] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:45:51] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:45:56] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:01] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:06] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:11] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:16] "GET /api/status HTTP/1.0" 200 39
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127.0.0.1 - - [31/Aug/2021 15:46:21] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:26] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:31] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:36] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:41] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:46] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:51] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:46:56] "GET /api/status HTTP/1.0" 200 39
[CTRL] GET /status
127.0.0.1 - - [31/Aug/2021 15:47:01] "GET /api/status HTTP/1.0" 200 39`